git.sesse.net Git - casparcg/blob - core/mixer/audio/audio_mixer.cpp

   1 /*\r
   2 * copyright (c) 2010 Sveriges Television AB <info@casparcg.com>\r
   3 *\r
   4 *  This file is part of CasparCG.\r
   5 *\r
   6 *    CasparCG is free software: you can redistribute it and/or modify\r
   7 *    it under the terms of the GNU General Public License as published by\r
   8 *    the Free Software Foundation, either version 3 of the License, or\r
   9 *    (at your option) any later version.\r
  10 *\r
  11 *    CasparCG is distributed in the hope that it will be useful,\r
  12 *    but WITHOUT ANY WARRANTY; without even the implied warranty of\r
  13 *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\r
  14 *    GNU General Public License for more details.\r
  15 \r
  16 *    You should have received a copy of the GNU General Public License\r
  17 *    along with CasparCG.  If not, see <http://www.gnu.org/licenses/>.\r
  18 *\r
  19 */\r
  20 #include "../../stdafx.h"\r
  21 \r
  22 #include "audio_mixer.h"\r
  23 \r
  24 #include <core/mixer/write_frame.h>\r
  25 #include <core/producer/frame/frame_transform.h>\r
  26 \r
  27 #include <stack>\r
  28 #include <vector>\r
  29 \r
  30 #include <tbb/parallel_for.h>\r
  31 \r
  32 namespace caspar { namespace core {\r
  33 \r
  34 struct audio_item\r
  35 {\r
  36         const void*                     tag;\r
  37         frame_transform         transform;\r
  38         audio_buffer            audio_data;\r
  39 };\r
  40         \r
  41 struct audio_mixer::implementation\r
  42 {\r
  43         std::stack<core::frame_transform>                               transform_stack_;\r
  44         std::map<const void*, core::frame_transform>    prev_frame_transforms_;\r
  45         std::vector<audio_item>                                                 items_;\r
  46 \r
  47 public:\r
  48         implementation()\r
  49         {\r
  50                 transform_stack_.push(core::frame_transform());\r
  51         }\r
  52         \r
  53         void begin(core::basic_frame& frame)\r
  54         {\r
  55                 transform_stack_.push(transform_stack_.top()*frame.get_frame_transform());\r
  56         }\r
  57 \r
  58         void visit(core::write_frame& frame)\r
  59         {\r
  60                 if(transform_stack_.top().volume < 0.002 || frame.audio_data().empty())\r
  61                         return;\r
  62 \r
  63                 audio_item item;\r
  64                 item.tag                = frame.tag();\r
  65                 item.transform  = transform_stack_.top();\r
  66                 item.audio_data = std::move(frame.audio_data()); // Note: We don't need to care about upper/lower since audio_data is removed/moved from the last field.\r
  67 \r
  68                 items_.push_back(item);         \r
  69         }\r
  70 \r
  71         void begin(const core::frame_transform& transform)\r
  72         {\r
  73                 transform_stack_.push(transform_stack_.top()*transform);\r
  74         }\r
  75                 \r
  76         void end()\r
  77         {\r
  78                 transform_stack_.pop();\r
  79         }\r
  80         \r
  81         audio_buffer mix(const video_format_desc& format_desc)\r
  82         {       \r
  83                 CASPAR_ASSERT(format_desc.audio_channels == 2);\r
  84                 CASPAR_ASSERT(format_desc.audio_samples_per_frame % 4 == 0);\r
  85 \r
  86                 // NOTE: auto data should be larger than format_desc_.audio_samples_per_frame to allow sse to read/write beyond size.\r
  87 \r
  88                 auto intermediate       = std::vector<float, tbb::cache_aligned_allocator<float>>(format_desc.audio_samples_per_frame+128, 0.0f);\r
  89                 auto result                     = audio_buffer(format_desc.audio_samples_per_frame+128);        \r
  90                 auto result_128         = reinterpret_cast<__m128i*>(result.data());\r
  91 \r
  92                 std::map<const void*, core::frame_transform> next_frame_transforms;\r
  93                                 \r
  94                 BOOST_FOREACH(auto& item, items_)\r
  95                 {                                               \r
  96                         auto next = item.transform;\r
  97                         auto prev = next;\r
  98 \r
  99                         const auto it = prev_frame_transforms_.find(item.tag);\r
 100                         if(it != prev_frame_transforms_.end())\r
 101                                 prev = it->second;\r
 102                                 \r
 103                         next_frame_transforms[item.tag] = next; // Store all active tags, inactive tags will be removed at the end.\r
 104                                         \r
 105                         if(prev.volume < 0.001 && next.volume < 0.001)\r
 106                                 continue;\r
 107 \r
 108                         const float prev_volume = static_cast<float>(prev.volume);\r
 109                         const float next_volume = static_cast<float>(next.volume);\r
 110                                                                         \r
 111                         auto alpha              = (next_volume-prev_volume)/static_cast<float>(format_desc.audio_samples_per_frame/format_desc.audio_channels);\r
 112                         auto alpha_ps   = _mm_set_ps1(alpha*2.0f);\r
 113                         auto volume_ps  = _mm_setr_ps(prev_volume, prev_volume, prev_volume+alpha, prev_volume+alpha);\r
 114 \r
 115                         if(&item != &items_.back())\r
 116                         {\r
 117                                 for(size_t n = 0; n < format_desc.audio_samples_per_frame/4; ++n)\r
 118                                 {               \r
 119                                         auto sample_ps          = _mm_cvtepi32_ps(_mm_load_si128(reinterpret_cast<__m128i*>(&item.audio_data[n*4])));\r
 120                                         auto res_sample_ps      = _mm_load_ps(&intermediate[n*4]);                                                                                      \r
 121                                         sample_ps                       = _mm_mul_ps(sample_ps, volume_ps);     \r
 122                                         res_sample_ps           = _mm_add_ps(sample_ps, res_sample_ps); \r
 123 \r
 124                                         volume_ps                       = _mm_add_ps(volume_ps, alpha_ps);\r
 125 \r
 126                                         _mm_store_ps(&intermediate[n*4], res_sample_ps);\r
 127                                 }\r
 128                         }\r
 129                         else\r
 130                         {\r
 131                                 for(size_t n = 0; n < format_desc.audio_samples_per_frame/4; ++n)\r
 132                                 {               \r
 133                                         auto sample_ps          = _mm_cvtepi32_ps(_mm_load_si128(reinterpret_cast<__m128i*>(&item.audio_data[n*4])));\r
 134                                         auto res_sample_ps      = _mm_load_ps(&intermediate[n*4]);                                                                                      \r
 135                                         sample_ps                       = _mm_mul_ps(sample_ps, volume_ps);     \r
 136                                         res_sample_ps           = _mm_add_ps(sample_ps, res_sample_ps); \r
 137                                         \r
 138                                         _mm_stream_si128(result_128++, _mm_cvtps_epi32(res_sample_ps));\r
 139                                 }\r
 140                         }\r
 141                 }                               \r
 142 \r
 143                 items_.clear();\r
 144                 prev_frame_transforms_ = std::move(next_frame_transforms);      \r
 145 \r
 146                 result.resize(format_desc.audio_samples_per_frame);\r
 147                 return std::move(result);\r
 148         }\r
 149 };\r
 150 \r
 151 audio_mixer::audio_mixer() : impl_(new implementation()){}\r
 152 void audio_mixer::begin(core::basic_frame& frame){impl_->begin(frame);}\r
 153 void audio_mixer::visit(core::write_frame& frame){impl_->visit(frame);}\r
 154 void audio_mixer::end(){impl_->end();}\r
 155 audio_buffer audio_mixer::mix(const video_format_desc& format_desc){return impl_->mix(format_desc);}\r
 156 audio_mixer& audio_mixer::operator=(audio_mixer&& other)\r
 157 {\r
 158         impl_ = std::move(other.impl_);\r
 159         return *this;\r
 160 }\r
 161 \r
 162 }}